Ultimate Grilled Portobello Burger Beyond the Bun

Ingredients

• 1/4 cup (60 ml) Balsamic vinegar
• 2 tablespoons (30 ml) Olive oil, extra virgin
• 2 cloves Garlic, minced
• 1 tablespoon Fresh rosemary, chopped
• 1 tablespoon Fresh thyme, chopped
• 1 teaspoon Dijon mustard
• 1/2 teaspoon Salt
• 1/4 teaspoon Black pepper, freshly ground
• 4 large Portobello mushrooms, stems removed
• 2 tablespoons (30 ml) Olive oil, for brushing
• 4 Burger buns of your choice (brioche, sourdough etc.)
• Your favourite burger toppings (lettuce, tomato, cheese, mayo, ketchup, etc.)